add post process to more pcells

[joamatab]

@HelgeGehring
@sebastian-goeldi
@nikosavola
@tvt173

Could we do this in the cell decorator?
this would simplify the definition of the cell

This would need to be supported by kfactory as well if implemented

[tvt173]

i don't know how you plan to manage this with your flow, but i would generally agree that either doing it as a decorator or actually "post processing" the GDS after it is output would be better.

[sebastian-goeldi]

In kfactory the easiest way I see is this gdsfactory/kfactory#249

[joamatab]

this can be used for adding info, padding, or LVS marker layers that are different for each type of container

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (d48d75e) 72.39% compared to head (51a35fb) 72.36%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
gdsfactory/components/coupler.py	33.33%	1 Missing and 1 partial ⚠️
gdsfactory/components/resistance_sheet.py	33.33%	1 Missing and 1 partial ⚠️
gdsfactory/components/triangles.py	33.33%	1 Missing and 1 partial ⚠️
gdsfactory/components/via_stack.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2524      +/-   ##
==========================================
- Coverage   72.39%   72.36%   -0.03%     
==========================================
  Files         366      366              
  Lines       23640    23647       +7     
  Branches     3872     3876       +4     
==========================================
- Hits        17114    17113       -1     
- Misses       5361     5365       +4     
- Partials     1165     1169       +4     

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